linux-kernel - Re: [FIXUP v11] fixup! s390: vfio-ap: implement mediated device open callback

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Message-Id: <feaecda1-0da7-a23e-671b-a98799481aaf@de.ibm.com>
Date:   Fri, 28 Sep 2018 15:42:35 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Halil Pasic <pasic@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, fiuczy@...ux.vnet.ibm.com,
        buendgen@...ibm.com, Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: Re: [FIXUP v11] fixup! s390: vfio-ap: implement mediated device open
 callback



On 09/28/2018 03:41 PM, Halil Pasic wrote:
> 
> 
> On 09/28/2018 03:35 PM, Cornelia Huck wrote:
>> On Fri, 28 Sep 2018 09:33:21 -0400
>> Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
>>
>>> From: Tony Krowiak <akrowiak@...ux.ibm.com>
>>>
>>> Fixes case statement in vfio_ap_mdev_copy_masks() function in
>>> vfio-ap-ops.c.
>>> ---
>>>  drivers/s390/crypto/vfio_ap_ops.c | 3 ++-
>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
>>> index e1e1beaaeba5..86b42487a51c 100644
>>> --- a/drivers/s390/crypto/vfio_ap_ops.c
>>> +++ b/drivers/s390/crypto/vfio_ap_ops.c
>>> @@ -741,11 +741,12 @@ static void vfio_ap_mdev_copy_masks(struct ap_matrix_mdev *matrix_mdev)
>>>  		break;
>>>  	case CRYCB_FORMAT1:
>>>  	case CRYCB_FORMAT0:
>>> -	default:
>>>  		apm = (unsigned long *)crycb->apcb0.apm;
>>>  		aqm = (unsigned long *)crycb->apcb0.aqm;
>>>  		adm = (unsigned long *)crycb->apcb0.adm;
>>>  		break;
>>> +	default:
>>> +		return;
>>
>> /* cannot happen */
>>
>> ?
> 
> Or use something like BUG(). Without conveying that default is illegal we
> don't gain anything over the previous version IMHO.

Only WARN_ON, if at all.



> 
>>
>>>  	}
>>>  
>>>  	nbytes = DIV_ROUND_UP(matrix_mdev->matrix.apm_max + 1, BITS_PER_BYTE);
>>